Firearm for rim-fire cartridges



March 19, 1935. F. F. BURTON 1,994,565

FIREARM FOR RIM FIRE CARTRIDGES Filed Fe b. 4, 1953 by a blow from an e'ccentrically positionedfiring- Patented Mar. 19, 1935 a For.

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This invention relates .:to improvement fire arms, andparticularly-to that c1ass of'= firearms a point adjacent the peripheries threof. As previously constructed} a; firearm for rimpin orthe' like-"delivered upontheir rearffaces'at fire cartridges has usually bn provided with a Y I point which has atendency to shear the; rear'wallchamber thereof I: firing pinhaving a flatlor wedge-shapedimpact of the-cartridge being used and 'has' 'served -to pinch the rim i of the cartridge 1 against I a surface extending substantially at a right; angle to the axis of the cartridge? "This and similar constructions have. ofttimes occas ion'ed' the rupturing or; the cartridge, particularly at the peripheryyofitsrim, where the metal is already stretched,' due.to its being bul'ged outwardly-and folded during the manufactured the cartridge ;t o= form such r'im and the annular recess there forthemeception of the priming-compound; r 5

Efforts have-heretofore been the"objections"abovereferred to butWith'mbre or less indifierent results, inasmuch as efforts to avoid the rupturing of the cartridges have often resulted in decreasing the sureness of firing and vice versa. l I

One of the objectsof 'thepresent invention is to provide a firearm for rim-fire cartridges in which the danger' of rupturing rim-fire cartridges, by reason of the impact of the firing-pin thereupon, may be practically eliminated without, however, sacrificing sureness of firing. V

Other objects and advantages will appear to those skilled in the art from the following, taken in conjunction with .the accompanying drawing andthe appended claims.

Inthe accompanying'drawing: V i l Fig. I is a broken View. incentral longitudinal section of the rear end of the barrel and adjacent portions of a firearm forrim-fire cartridges, a loaded cartridge being shown in place in the fir- 'ing-chamber and thefiring-pin being shown as retracted, preparatory to engaging and. firing the cartridge; 7

Fig. 2 is a view corresponding to Fig. 1 but show-' ing the firing-pin engaged with the cartridge which has thus been fired; and a Fig. 3 is a view in rear-end elevation of the barrel, showing a fired cartridge in the cartridge- The particular firearmherem chosen-for the illustration'of my invention includes a barrel'lO having an externally-threaded shank 11 engaged withan internally-threaded socket the made to-overco'mef lARTItIDGESJ 1933, sear Ndjfet'aissf c'eiver' or body-member 13 of the arm.

Movable in the receiver -in the usual'manner. of bolt-action firearms, is a breech-bolt 14 carrying a reciprocating-firing-pin 15 having a spherically-contoured impact-point 16 eccentricallypo 1 sitioned with respect to the axis of the barrel =10.

and hence with respect to the axis of acartridgechamberl'? in the rear portionthereof. 1 'l 1 f1 The firing pin .15; above referred to, cooperates with afiring-anvil 18 in such manner, as to simul' taneously pinch and bend a portion of the rim 19" of a'rim-fire cartridge 20 to detonate a body of priming-mixturezl located within the .rear end of the cartridge and extending outwardly into an jtojWinchester Repeating ArmsCompany, New {Ha n (lonn-g-a corpo o ofM rylan 5;

annular recess 22 within the said-rim, aswill.

hereinafterzappear. Preferably, the-center line;

or axis of the eccentrically-pos iti'oned firing pinf 15 is located well within the peripheryoftherim 19 to such a degree as to intersect the cartridge-.:; 7

chamber l'lL f a a it The firing-anvil 18 before referred to forms the; bottom of an annularrim-receiving recess-23 the rear end of the barrel 10 and slopes inwardly: andffor-wardly to intersect the cartridge-chamber;

"17 in the said barrel whichreceives the cartridge zoasshowfn."

. r g For-the purpose of convenience of manufacturas the slopingHfiring-anVil 18 is annular i'n form' though, obviously, the said anvil may be merely of local extent, 'so'long as it is in line with the,

firing-pin .15 for being coacted with thereby infiring a cartridge. 7

When the firing-pin moves forwardly from the position in which it is shown in Fig. 1 into the position in which it is shownin Fig. 2, the

portion of the rim 19 of the cartridge 20 with which it contacts is simultaneously pinched and. bent so as to substantially conform to the slope of the firing-anvil 18, as shown in the latter figure. It will be noted by reference to thedrawing that the portion 16 of the spherically-con toured impact-point 16 forms an in lpact-sur'facev substantially conforming to and complementing the sloping firing-anvil. 18 to produce the pinching and bending action just referred to.

V The simultaneous pinchingand bending action above referred to acts to detonate the primingmixture 21 with the maximum of certainty without, however, shearing the rear-wall of the cartridge or pinching the rim thereof to such a degree as would cause the rupture of the same either before" or after the firing of the cartridge.

In other words, during the firing action and .owing primarily to the sloping character of the ii" it ofthe cartridge be pinched or crushed to sucha' degree as toweaken the samesuificiently to cause a rupture incident to the explosion taking place within the cartridge. Preferably and as shown, the center line of the firing-pin 15 is located Well inside the fold of the rim 18, so that no such strain is placed thereon as would -occasion a rup-,

ture, as just referred to. w I .7 The invention may be carriedout in otherspecific ways than that herein set igrth without departing from the spirit and essential characteristics of the invention, and'th'e present mbodi-' ment is, therefore, to be considered in;all; re-.

spects as illustrative and not restrictive,fand all Y changes coming Within themeaning and equivalency range of the appended claims are intended to be embraced therein.

I'claim:

said. firing-anvil. z p H V 7 t 2. A firearm for rim-fire-cartridges, havingan, inwardly-and-forwardly-sloping firing-anvil adjaoeht the rear .end. ofv the cartridge-chamber th'erein;;and a firing-pin eccentrically-positioned with respect tortheaxis ofthe said cartridge chamber and having anrinwardlyaand-forwardly-sloping impact-surface complementing the,

said sloping firing-anvil and positioned to, simultaneously pinch a portionofgthe rim of a rim-fire cartridge and bend the same into an angular pe sition'sdbstantially: corresponding to the slope of thesaidcfiringanvilvg2: .7 t

3. A' firearm for rim-fire cartridges,:hay ing an inwardly-andeforwardly-sloping firing-anvil adjacent the rear; end of the, cartridge chamber therein; and a firing-pin eccentrically-positioned with respect to the axis of the said cartridgechamber and having a substantially spherically- 'contoured inwardly-and-forwardly-sloping impact-surface complementing the said sloping firing-anvil and positioned to-simultaneously pinch a portion of the rim of a rim-fire cartridge and bend the same into an angular position substantiallycorresponding to the, slope of the said firing-anvil.

A.- A firearm for rim-fire cartridges, having an inward]y-and-forwardly-sloping firing-anvil adjacent the rear end'of the cartridge-chamber thereimand a firing-rpm eccentrically-positioned with respect -t'o.,the axis of the said cartridgec'hamber blut having its own axis intersecting the said chamber, and located in position to simultafieously' pinch a=portion of the rim of a rim fire cartridge'and bend the same into an angular position-substantially corresponding to the slope of the sa'id firing-anvil, v j

;- 5., A firearm for rim-fire cartridges, havingcan inwardly andi-forwardly-sloping firing-anvil ada a jaoentQ-the rearend of, theY cartridge-chamber 1's, A.-firearm for rim-fire cartridges, having an, inwardly-and-forweirdly-sloping firings-anvil ad-g; jacent the; rearv end of .7 the j cartridge-chamber V therein; and, afiring-pin eccentricallymositioned with respectgtolthevaxis of the said cartridgechamber and located in position to simultaneouschamber buthaving its iown axis intersecting the I said chamber, and havingan, inWardlyand-forwardly-sloping impact-surface complementing thesaid sloping firinganvil a'nd positioned, to; si-. multaneously pinch a portion of the rim of a rimfire cartridge and bendthe-same into antangular position; substantiallycorresponding to; the slope of thesa-id firing-anviliv I 6;, A,firearm,-for rim-firejcartridges, having an.

inwardlyeand-forwardly-sloping: firing-anvil adjacent the rear end of, the, partridge-chamber therein and a; firing-pin eceentrically-positioned with respect; to the axis of the said,cartrldgechamber but having itsown axis intersecting the said chamber, and having a substantially spherically-contoured inwardly--andrforwardly-sloping impact-surface complementing i the said sloping firing-anvil. and positioned to simultaneous- 1y pinch a' portion of the rimiof a rim-fire cartifidge and bend the same into an angular position-{ substantially; corresponding to the slope of the said firing-anvil.

V FRANKR'BURTON. 

